Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
va hanh » va thanh, va danh, ban hanh
vu cac » va cac, tu cac, vu cao
tu cua » hu cua, vu cua
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu cac ky tang ma hoi. hieu ((ve cac) OR (va cam)) luc ((va hanh) OR (van hanh)) tu cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu cac ky tang ma hoi. hieu ((ve cac) or (va cam)) luc ((va hanh) OR (van hanh)) tu cua vat~".
• Adding a wildcard symbol may retrieve word variants: vu cac ky tang ma hoi. hieu ((ve cac) or (va cam)) luc ((va hanh) OR (van hanh)) tu cua vat*.